After the brake lines blew in two places on my dad's truck we figured it was best to change them all out. We tend to run our trucks into the ground so stainless steel was the way to go.
Searching the web, I found two companies doing stainless kits for a 2004 Silverado 2500HD, Classic Tube and Inline Tube. Classic Tube has you enter year/make/model then gives you a list of vehicle part #'s so you get to hope you've picked the right kit. Inline Tube has you enter year/make/model then goes on to ask specific questions about your vehicle.... "does this line exit here or here, does this line run like this or that, does the axle hose attach on the tube or the diff" etc.. etc..
I was certain that I would be getting the exact lines I needed! Gave them a call on Thursday afternoon, placed my order, and the Fed Ex truck was here on Tuesday with my box of brake lines
The lines all fit where they belong and they were $30.00 less expensive than the lowest price I could find for Classic Tube's kit 
If I ever have to get a complete line kit again, I know where I'll be ordering from
BTW they also do replacement transmission and fuel lines
